6 Answers
6

This is a very funny way to kill her. Just cast fury on her and the people around her will kill her for you. Simple as that. Hah, I paid Athis for lessons on one-handed weapons, and leveled up my one-handed skill. Then I casted fury on him and guess what??? Everyone got out of there beds and started to kill him. I was helping kill him too, and no one came after to kill me. Hah, pretty smart. Lol.

If you're willing to bide your time, the best bet is to finish the Companions quest line. Once you do, any member of the Companions - including Nadja - will agree to accompany you as a follower. Which means you can take her to a nice secluded shack in the middle of nowhere, and then take her out.

If you don't have the patience, or prefer a more... public method, I'll refer you to questions like this one. Essentially, raise your Sneak, (and optionally pickpocket or weapon) skills, wait for the right moment, and strike when nobody is looking - this will take some practice, and a bit of skill, but it's good training for the Brotherhood after all.

that would be a really evil genius thing to do(the 1st option). can I still finish the companion quest line if I kill her now? P.S. I bet you don't know, but what is your educated guess.
–
IAdapterDec 14 '11 at 23:57

2

I don't have a save file from before completion of the chain to check, but since she's not involved in any quests, she's unlikely to be flagged as Essential.
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LessPop_MoreFizz♦Dec 15 '11 at 0:20

After completing the companion's quest line, I took the non-essential, and quite annoying companions to the underforge and slaughtered them, 1 - it gives you a cool cutscene, and 2 - impossible to get a bounty as it is only the two of you.